Hi Todd Millett,
I'm sorry for the misunderstanding. There was a problem in WPF so assumed that the ticket was for WPF.
However I'm not sure which part is not as you expected. We've tried to provide the same navigation as WPF Menu control.
Clicking Up/Down will move to Previous/Next root menu items if submenu is not opened. If current menu item has open submenu then going to other root menu item with keyboard will automatically expand its submenu and focus its first subitem. May be this is why you think that Up/Down doesn't move through root menu items.
Left/Right arrow navigates to Previous/Next root menu items if current item doesn't have submenu items. If it have then Left/Right arrow will collapse/expand submenu.
I hope that this clarifies how keyboard navigation works.
Can you specify where you expect different behavior and in which case?
the Telerik team